"I noticed that I woke up each day energized and ready to go. I noticed that I was still sharp and productive throughout the day and into the night. I noticed a transition from being tired after riding... to being tired if I didn't ride! It was at that point that I 'discovered' pedalocity." --Michael Sicurello, Well On Earth
You wouldn't drive a car without a windscreen...
A cheap pair of safety glasses are perfect for keeping that unexpected swarm of bugs out of your eyes...